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Redesigned ES PLUS series calculators featuring easy-to-understand Natural Textbook Display, Non-Programmable Scientific Calculator with 417 FunctionsStylish design but same function as Casio FX-991ESPLUS 1st edition, 10-digit mantissa + 2-digit exponential displayBasic Trigonometrical & Statistics Functions, and many more functionsColour coded keypad for easy key differentiation, Simple and easy to use, Comes with new slide on hard case3-years warranty by manufacturerscientific calculator casioscientific calculatorcasio fx 991es plusscientific calculator fx 991calculator casio originalcalculator casiofx991es pluscasio scientific calculatorscientific calculator 991escasio calculator